Stores and Nested Subagents
Agent applications need memory and delegation boundaries.
Use the right surface
After this you can pick SDK stores and subagents for the right job and define done.
Done means you can choose store and subagent patterns that keep state explainable.
The same agent loop can run in a terminal, script, CI job or SDK-backed internal tool.
Use SDK stores and subagents when an agent-backed tool needs persistence, auditability or delegated work. Keep the boundary narrow.
Start small. Name the job, attach the context that proves the point and decide what evidence would make the output trustworthy.
Read the loop before touching the controls. The first beat frames the work, the second uses Cursor, the third checks the result and the fourth leaves a handoff someone else can inspect.
Interactive diagram. Tab through its regions; each focused region shows its detail in the panel below.
Run this loop in a real repo.
- Entry point
- SDK stores, conversations, JSONL/custom persistence and nested subagents
- Source
- June 2026 SDK changelog, SDK docs and subagents docs
Use the source as the product reference.
Ask Cursor for an output you can inspect.
If the output cannot be checked, narrow the task before you continue.
A good run leaves a file, setting, screenshot, command result or written claim you can verify.
Takeaway. Done means you can choose store and subagent patterns that keep state explainable.
Self-check
QWhen should you reach for SDK stores and subagents?
Run it
After this you can do the task with clear scope and one proof point.
Treat this as a short practice loop, not a product tour. The task should be small enough that you can inspect the result without trusting the summary.
- 1Decide what state must survive beyond one run.
- 2Choose SQLite, JSONL or a custom store based on audit and query needs.
- 3Delegate independent subtasks to nested subagents and preserve request IDs for support.
- 4Persist summaries and artifacts, not unnecessary secrets.
The exercise is complete only when the proof matches the requested outcome. If the proof is weak, reduce the scope or fix the context instead of adding more instructions.
Keep the task small enough to review.
Subagents have bounded outputs.
Takeaway. Stop when you have proof: Stored state has a retention reason..
Self-check
QWhich habit makes this workflow safe to use on a real project?
Check it
After this you can find the first failed check before changing tools.
Verification decides the next move.
Interactive diagram. Tab through its regions; each focused region shows its detail in the panel below.
Pick a row to see what to look for.
Use the first failure signal as the next prompt. Broad retries usually make the run noisier; a narrow retry gives Cursor a concrete repair target.
No proof means more checking.
Use a real repo or admin setting. Save the prompt, context and proof.
Takeaway. If it fails, find the first failed check.
Self-check
QThe workflow failed. What is the best first move?